Re: [PATCH] staging: greybus: power_supply: Use struct_size() helper

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Hi Gustavo,
Thanks a lot for the patch.

On Wed 03 Apr 2019 at 21:58, Gustavo A. R. Silva wrote:
Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace code of the following form:

sizeof(*resp) + props_count * sizeof(struct gb_power_supply_props_desc)

with:

struct_size(resp, props, props_count)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

What are the odds of 2 people changing same code in greybus in
the same day :).

But it happened, so as Johan asked please rebase on top of his
patch. that would be great.

---
Cheers,
	Rui

---
 drivers/staging/greybus/power_supply.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/power_supply.c b/drivers/staging/greybus/power_supply.c
index 0529e5628c24..40cc2d462ba0 100644
--- a/drivers/staging/greybus/power_supply.c
+++ b/drivers/staging/greybus/power_supply.c
@@ -520,8 +520,8 @@ static int gb_power_supply_prop_descriptors_get(struct gb_power_supply *gbpsy) op = gb_operation_create(connection,
 				 GB_POWER_SUPPLY_TYPE_GET_PROP_DESCRIPTORS,
- sizeof(req), sizeof(*resp) + props_count * - sizeof(struct gb_power_supply_props_desc),
+				 sizeof(req),
+ struct_size(resp, props, props_count),
 				 GFP_KERNEL);
 	if (!op)
 		return -ENOMEM;

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